Year: 1998
Type: preprint
Abstract: A whole class of non-perturbative QCD studies, e.g. the instanton models, chiral quark models, etc. indicates that the effective degrees of freedom for the physics in the low Q^(2) < 1 GeV^(2) region could be the constituent quarks (CQs) and internal Goldstone bosons (IGBs). This leads to a nucleon structure with the spin being carried by three constituent quark systems, each composed of a massive compact CQ surrounded by a q\bar{q} sea perturbatively generated by the valence quark's IGB emissions. Such a CQ-system has a total angular momentum of 1/2 and a small anomalous magnetic moment, built up from a quark-spin polarization and a significant orbital motion in the quark sea. The distinctive phenomenological signal for such a non-perturbative structure is that the sea-quarks are polarized negatively, while the antiquarks are not polarized. This picture also suggests a negligibly small gluon polarization. All such features can be tested by experiments in the near future.
Source: arXiv (Cornell University)
Authors: Cheng, T. P., Li, Ling-Fong
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2053097085